Date of Birth Calculator
Find your birth year or birth date from your current age. Enter age in years, years+months, or age in days for the exact date. Calculate milestone dates like 18, 21, 65, and 67.
Birth Year
—
Earliest Birth Date —
Latest Birth Date —
Extended More scenarios, charts & detailed breakdown ▾
Birth Year
—
Turns Next Age —
Professional Full parameters & maximum detail ▾
Birth Date
Exact Birth Date —
Life Milestones
Retirement Date (age 67) —
Medicare Eligibility (age 65) —
Legal Drinking Age (age 21) —
Voting Age (age 18) —
Social Security Full Retirement (age 67) —
How to Use This Calculator
- Enter your current age and today's date to see your birth year range.
- Use From Age in Years+Months for a more precise birth month estimate.
- Use From Milestone to find exactly when you will turn a specific age (18, 21, 30, etc.).
- Switch to Professional and enter age in days for an exact birth date, plus all key legal age dates.
Formula
Birth Year = Current Year − Age
Exact Birth Date: Reference Date − Age in Days
Milestone Date = Birth Date + Milestone Age (years)
Example
Example: Age 30, today April 5, 2026. Birth year = 2026 − 30 = 1996. Turning 18 on April 5, 2014 (already passed). Turning 65 on April 5, 2061.
Frequently Asked Questions
- Birth Year = Current Year − Age. If you are 30 years old in 2026, you were born in 1996 (or 1995 if you have not had your birthday yet this year).
- When you only know age in whole years, the birth date could be anywhere within a 12-month window. For example, if you are 30 in April 2026, you were born between May 2025 and April 2026, but in the year 1995 or 1996.
- If you know your age in exact days (e.g., from a medical record), the Professional tab calculates the exact birth date by subtracting those days from the reference date.
- The Professional tier shows the exact date you will reach age 18 (voting), 21 (drinking), 65 (Medicare eligibility), and 67 (Social Security full retirement age).
- Yes — an age calculator goes from birth date → current age. This date of birth calculator goes in reverse: from current age → birth year/date.